1 bit memory cell

1 Bit Memory Cell

Introduction

A memory element in some medium in which 1 bit of information (1 or 0) can be stored untill neccesary and its content can be replaced by a new value. flip flop is known as basic digital memory circuit.

• It has two stable states namely logic 1 and logic 0 state also known as set state and reset state.

Construction

• The basic digital memory circuit is designed by cross-coupling two NOR gates or NAND gates.
• The output of each gate is connected to the input of other gate.
• Such feedback combination is known as Flip Flop.

Working

• The output of Flip Flop is complimentary.This is one of the most important characteristic of Flip Flop.
• Consider N1 and N2 be two NOT or NAND gates and Q & Q' be their output.
• Let output of N1 (Q) be 1.
• Therefore input of N2 becomes 1. As single input NAND or NOR is used, the output of N2 is 0.
• This output is given to the input of N1 and hence Q=1.
• This result confirms our original assumption, Q=1.
• Similarly, we can conclude that when Q=0, Q'=1 is also a possible state.
• The case in which both the outputs are same is not consistent.